Satellites capture two strange patterns in the desert next to Area 51.

A mystery in Hawaii points to human sacrifice and a shape-shifting god.

Satellites lead experts to an island that may be linked to a massacre.

When experts spot what appears to be an abandoned city in the Caspian Sea, they investigate declassified Cold War evidence to reveal an Atlantis-like city built by the Soviets; what they find exposes its long-lost secrets.

Satellites capture evidence of catastrophic and secret military testing.

Satellite images capture a giant symbol mysteriously carved into the expanse of Australia's Great Victoria Desert; an investigation reveals a secret nuclear weapons-testing cover-up by the British government with numerous aboriginal casualties.

Satellites capture bizarre circular structures in the forests of England.

Satellites capture mysterious stone objects across the Arizona mountains.

Satellites capture a castle-like structure hidden in Scottish woodlands.

Satellites capture rocks in the shape of a fingerprint on a Swedish island.

Satellites capture a bizarre pattern of circles in a remote English forest.

Aerial imaging captures a complex of ancient Roman buildings in Yorkshire.

Satellites capture a gigantic oval carved into the forests of New Jersey.

Satellites capture a mysterious collection of ghost towns in Belarus.

Satellites capture a cone-like structure in the mountains of Turkey.

Satellites capture a bizarre industrial complex in desert of Kazakhstan.

Satellites capture dozens of parallel lines hidden in Polish woodlands.

Satellites capture bizarre structures on the Greek island of Kefalonia.

Satellites capture ruins amid bizarre structures on a Welsh mountaintop.

Satellite images capture a triangular castle-like tower located on the Mediterranean island of Sardinia; experts investigate the relics of a declining ancient civilization that may have suffered a celestial catastrophe.

Satellite images capture two conjoined circular structures embedded in the lush and rolling landscape of Ireland; experts investigate and uncover an ancient site linked to legendary figures and the elusive hunt for the Ark of the Covenant.

Drone images capture oddly shaped towers in a forest clearing near Moscow.

Satellites capture a series of zigzagging patterns in Polish woodlands.

Drone images capture enormous holes scattered along the Dead Sea coastline.

Satellites capture bizarre markings etched deep in the mountains of Spain.